[HECnet] TK50 issues

[Hans Vlems]

I think so too. Methanol is a very good solvent, but not necessarily originele to its acidity. HF is a weak acid but may be stored in very few other materials, not even in glass.

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   Origineel bericht   
Van: Lee Gleason
Verzonden: zaterdag 17 mei 2014 22:49
Aan: hecnet at Update.UU.SE
Beantwoorden: hecnet at Update.UU.SE
Onderwerp: Re: [HECnet] TK50 issues



it's a good point - I just looked and it's not that different from water. 
But, I've seen fuel systems that ran on pure methanol corroded pretty 
quickly if they weren't cleaned out after a run. I guess the corrosion is 
enhanced in methanol by effects on the surface layer of metals like aluminum 
and magnesium, that depend on a surface layer to halt corrosion.

--
Lee K. Gleason N5ZMR
Control-G Consultants
lee.gleason at comcast.net


-----Original Message----- 
From: Hans Vlems
Sent: Saturday, May 17, 2014 3:31 PM
To: hecnet at Update.UU.SE
Subject: Re: [HECnet] TK50 issues

Lee, have you looked up the pKa for methanol?

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Origineel bericht
Van: Lee Gleason
Verzonden: zaterdag 17 mei 2014 22:17
Aan: hecnet at Update.UU.SE
Beantwoorden: hecnet at Update.UU.SE
Onderwerp: Re: [HECnet] TK50 issues




Methanol would do as well but is more poisonous.


Careful with methanol - it's a more potent solvent in general than ethanol
or isopropanol. Lots of rubber and plastic compounds are attacked by
methanol.

Additionally, the H in the OH group isn't held onto as tightly as in the
other organic OH compounds, so methanol is corrosive to metal.

It's also a middlin' good oxidizer for some metals.

--
Lee K. Gleason N5ZMR
Control-G Consultants
lee.gleason at comcast.net